In the King of the Hill episode "Bills Are Made to be Broken", Bill, an offensive lineman, has a career record for rushing touchdowns at Arlen High that is about to be broken by a Senior running back named Ricky Suggs. After the title sequence, Bill, Hank, Dale, and Boomhauer are seen at an Arlen home game. At this game, Ricky ties Bill's record by returning an interception for a touchdown. The only problem, however, is that Ricky is a running back, and running backs don't play defense and as such cannot intercept passes. Despite this, Ricky is also seen breaking Bill's record later by running a touchdown in on offense, strangely.

Well, it's possible that he plays both defense and offense... When I was in high school I was a cornerback on defense and a wide-out on offense. But if he indeed caught a pass and returned it on defense, those yards wouldn't accumulate for offensive rushing and would not, therefore, break Bill's record...
This may be, in fact, a good slip-up.